Plant Growth and Mineral Nutrition — BIOLOGY STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYPlant Growth and Mineral Nutrition4 Marks
Question
Phytochrome
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Answer
$1.$ These are proteinaceous pigments present
$2.$ Phytochrome exists in two interconvertible forms. $P_r$ and $P_{fr}.$
$3.$ Phytochromes are located in cell membranes of chlorophyllous cells.
$4.$ When $P_{fr}$ absorbs red light it is converted to $P_r.$
$5. \ P_{fr} $ is accumulated in plants during daytime and inhibits flowering in $\text{SDP}$ but initiates flowering in $\text{LDP}$
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